gearman/libhostile/malloc.c

/*  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
 *
 *  Data Differential's libhostle
 *
 *  Copyright (C) 2012 Data Differential, http://datadifferential.com/
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions are
 *  met:
 *
 *      * Redistributions of source code must retain the above copyright
 *  notice, this list of conditions and the following disclaimer.
 *
 *      * Redistributions in binary form must reproduce the above
 *  copyright notice, this list of conditions and the following disclaimer
 *  in the documentation and/or other materials provided with the
 *  distribution.
 *
 *      * The names of its contributors may not be used to endorse or
 *  promote products derived from this software without specific prior
 *  written permission.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 *  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 *  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 */

#include "gear_config.h"

#include <libhostile/initialize.h>
#include <libhostile/function.h>

#include <errno.h>
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>

static int not_until= 500;

static struct function_st __function;
static __thread char unique_ptr;

static pthread_once_t function_lookup_once = PTHREAD_ONCE_INIT;
static void set_malloc(void)
{
  __function= set_function("malloc", "HOSTILE_MALLOC");
}

void *malloc(size_t size)
{
  hostile_initialize();
  (void) pthread_once(&function_lookup_once, set_malloc);

  if (is_called() == false)
  {
    if (__function.frequency)
    {
      if (--not_until < 0 && random() % __function.frequency)
      {
        fprintf(stderr, "Mid=evil on malloc()\n");
        errno= ENOMEM;
        return NULL;
      }
    }
  }

  set_called_ptr(&unique_ptr);
  void *ret= __function.function.malloc(size);
  reset_called_ptr(&unique_ptr);

  return ret;
}